require 'digest/sha1'
class User < ActiveRecord::Base
  
  belongs_to :company
  
  has_many :project_assignments, :dependent => :destroy
  has_many :projects, :through => :project_assignments
  
  has_many :subordinateships, :dependent => :destroy
  has_many :subordinates, :through => :subordinateships
  
  has_many :comments, :dependent => :destroy
  
  has_many :hours
  
  # Has attachments (images)
  has_attached_file :photo, :styles => { :small => "40x40#", :thumb => "80x80#", :normal => "300x300>" }
  
  # Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :name, :email
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :email,    :within => 3..100
  validates_uniqueness_of   :email, :case_sensitive => false
  validates_format_of       :email, :with => /\A([a-z0-9\.\-\+]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
  before_save :encrypt_password
  
  # prevents a user from submitting a crafted form that bypasses activation
  # anything else you want your user to change should be added here.
  attr_accessible :name, :email, :password, :password_confirmation, :admin, :superior, :time_zone, :photo

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(email, password, subdomain = nil)
    u = find_by_email(email) # need to get the salt
    unless u.nil?
      
      # When user login from frontpage, get user's subdomain otherwise compare given subdomain
      if subdomain.nil?
        c = u.company.subdomain
      else
        if u.company.subdomain.eql?(subdomain)
          c = u.company.subdomain
        end
      end
    end
    u && c && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at 
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    remember_me_for 2.weeks
  end

  def remember_me_for(time)
    remember_me_until time.from_now.utc
  end

  def remember_me_until(time)
    self.remember_token_expires_at = time
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  # Returns true if the user has just been activated.
  def recently_activated?
    @activated
  end

  protected
    # before filter 
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{email}--") if new_record?
      self.crypted_password = encrypt(password)
    end
      
    def password_required?
      crypted_password.blank? || !password.blank?
    end
    
end
